class_docstr: This plan is used for storing information required for rename table
  operations.
  Arguments:
      old_table {TableRef} -- table ref for table to be renamed in storage
      new_name {TableInfo} -- new name of old_table
code: def old_table(self):
      return self._old_table
  
file_path: evadb/evadb/plan_nodes/rename_plan.py
imports: from evadb.parser.table_ref import TableInfo, TableRef
  from evadb.plan_nodes.abstract_plan import AbstractPlan
  from evadb.plan_nodes.types import PlanOprType
label_desc: Use image node_id 2 for calling the RenamePlan obj's underlying member method code with example usage: obj.old_table() and returns: self